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Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Adaptive antennas which are used in systems for mobile communications (e.g. Global System for Mobile Communications, GSM; Enhanced Data rates for GSM Evolution, EDGE) can be defined as a combination of an antenna array and the adaptive digital processing of transmit and receive signals. They are very powerful to suppress interferers. Very often only two antenna branches exist due to complexity constrains or existing installations for maximum ratio combining. This means that only one interferer can be suppressed (Fig. 1) although in many cases at least two interferers are present.
The core of this invention is not only to model the wanted signal but also one interferer signal. Total suppression of a second interferer can also be achieved for two antenna branches. The modeled interferer is not suppressed but can be rejected by a following interference-rejection detection scheme which can usually handle only one interferer for complexity reasons.

Copyright

SIEMENS AG 2003

Country

Germany

Language

English (United States)

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Adaptive antennas which are used in systems for mobile communications (e.g. Global System for Mobile Communications, GSM; Enhanced Data rates for GSM Evolution, EDGE) can be defined as a combination of an antenna array and the adaptive digital processing of transmit and receive signals. They are very powerful to suppress interferers. Very often only two antenna branches exist due to complexity constrains or existing installations for maximum ratio combining. This means that only one interferer can be suppressed (Fig. 1) although in many cases at least two interferers are present.

The core of this invention is not only to model the wanted signal but also one interferer signal. Total suppression of a second interferer can also be achieved for two antenna branches. The modeled interferer is not suppressed but can be rejected by a following interference-rejection detection scheme which can usually handle only one interferer for complexity reasons.

The modeled reference signal models both the wanted signal (C) and one interferer signal (I) (Fig. 2). The latter can be either the dominant or the secondary interferer. The specific choice can be dictated by the behaviour of the following interference-rejecting detection scheme and the channel estimation quality achievable for the remaining interferer. In the asynchronous case, i.e. wi...